Introduce the method of dispersion of pearlescent pigments

There are generally three methods of dispersing pearlescent pigments: dry blending, melt shearing and liquid grinding. Dry mixing method refers to the mixing of pigments and resins from low to high strength, and the dispersion of pigments is mainly achieved through impact grinding, and its primary equipment is a high and low speed mixer; The melt shear method transmits large shear stresses through the molten resin under kneading. The rule of liquid grinding is to disperse the pigment by impact shear force through a liquid carrier.

At present, there are mainly the following commodity methods for dispersion pigments that can be solved in the market: pre-dispersed pigments, paste pigments and masterbatches. In addition, there are some targeted products such as color cakes, color pastes and so on.

First, it is processed into a pigment swatch by a professional manufacturer

The so-called pigment swatches, also known as pure color pastes, color granules, dry sheets, flakes, pre-dispersed pigments, refer to a solid homogeneous mixture of pigments with a specific carrier resin, i.e., pigments pre-dispersed in a high concentration in the resin. The pigment content in the pre-dispersed pigment chips is relatively high. Depending on the system, it is generally between 50-70% and the proportion of carrier resin is about 30-50%. Certain pigment swatch types, such as nitrocellulose (N/C) systems, also include environmentally friendly plasticizers. The pre-dispersed pigment swatch, which is equivalent to the pigments and resins manufactured by the ink manufacturer in proportion, can be directly incorporated into the ink formulation, and can also be dispersed into semi-finished products - colorants according to requirements, and then the colorants are mixed in the way of inks to make ink-made oils. Since the pre-dispersed pigments can be easily dispersed on a high-speed disperser, the fineness of dispersion can fully meet the requirements of general inks. Therefore, the ease of dispersion is its greater strength. If the fineness of the ink product is required, or the nanometer effect is required, the semi-finished paste can be quickly sanded, and the performance of the paste can be described as "excellent kurtosis", regardless of its viscosity. The color, shine and brightness are unmatched. The price factor restricts the sale and application of pre-dispersed pigments. The author has always hoped that it can be commercialized on a large scale and reduce the cost from the source. If we can work with pigment manufacturers, we will not only be able to control the cost of raw materials, but also make great strides in skills and services.

‍

Second, it is a pulp pigment produced directly by the pigment production factory

After the ink, the coating factory can directly formulate the product in production, which can save the time-consuming and laborious grinding process, and the effect on the product is more satisfied. In a general sense, slurry pigment (color paste) refers to the wet filter cake of the pigment production factory, which adopts a dehydration process to disperse the pigment into various base materials to make a color paste. In general, the proportion of organic pigments is small, and the pigment content of the colorant paste is also low. However, the proportion of inorganic pigments can reach a higher pigment content. Slurry pigments can adhere to the particle size of pigment precipitation, and have the characteristics of excellent fineness, brilliant color and high color strength.

Third, masterbatch.

Pearlescent pigment order masterbatch refers to the pigment particles made by grinding or twin screw extrusion evenly dispersed into the resin in a proportion of 20%-80%, which is called pigment concentration or pigment preparation in the United States. It has the advantages of coloring, active metering and transportation, energy saving, dust-free, pollution-free and so on. It is widely used for coloring plastics and other materials. In the meantime, the carrier is an important part of the masterbatch, and its function is to enhance the affinity between the pigment and the resin to be colored, and to improve the dispersion and mixing of the coloring components and the resin. By using the metallocene catalytic composition of resin as a carrier, the synergy and dispersion of pigments in the mother guess can be greatly improved. With the improvement of the dispersion of the pigment in the mother guess, a more homogeneous phase can be obtained. As a result, the amount of pigment can be reduced, but at the same time, a high coloring quality can be maintained. This is because the composition of metallocene catalytic resin is different from that of Z-N catalytic resin, and the metallocene catalytic resin can be used as a carrier to prepare high concentration of colorful particles, and the pigment content can be as high as 80%. In addition, the masterbatch with metallocene catalytic composition resin as the carrier is not only simple to color, but also can be made into masterbatch.